Grinding-machine.



A. B. LANDIS.

GRINDING MAGHINE.

APPLICATION IILEI) JULY 7,1909.

1,017,879, I Patented Feb.20, 1912.

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IVITNESSES:

A. B. LANDIS. GRINDING MACHINE. APPLIOATION FILED JULY 7,1909.

1,017,879, Patented Feb. 20,1912.

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A. B. LANDIS. eRINDINe MACHINE.

APPLICATION FILED JULY 7,1909.

Patented Feb. 20, 1912.

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A. B. LANDIS. GRINDING MACHINE.

APPLICATION FILED JULY 7,1909.

1,01 7,879. Patented Feb. 20, i912.

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WU'NESSE' if LVVENTOR. 'QT 7.3 .v BY

1 ATT NEY.

,i ABRAHAM B. LANDIS, OF'WAYNESBORO, PENNSYLVANIA.

GRINDING-MACHINE.

homere.

Specification of Letters Patent.

Patent-ea rei. eo, i912?.

Application led July 7, 1909. Serial No. 506,356;

To all whomtt may concern:

Be itknown that I, ABRAHAM B. LANois, a citizen of the vUnited States, residing 'at .Waynesborm in the county of Franklin and State of Pennsylvania, have invented certain new and useful Improvements in Grinding-Machines, of which the following is a specification.

My said invention consists in .various improvements in the details ci construction of grinding machines, whereby such a machine is provided for grinding cam-shafts, or shafts having a multiplicity of cam surfaces, such as. are used in automobile construction, which will grind said cams accurately or" the shape desired and pass automatically from one cam to the next throughout the length of the shaft during the operation, all as will be hereinafter more fully described and claimed.

Referring to the accompanying drawings which are made a part hereo and on which similar reference characters indicate similar parts, Figure l is a top oreplan view oil a portion oi a grinding machine embodying my said improvements, Fig. 2. a rear elevation of the same partly in section, Fig. 3 an end elevatioiuand Figs. 4C, 5 and (i detail views illustrating' certain parts more clearly.

In said drawings the portions marked represent the bed ot the machine, the carriage and C the slider. f

in general the structure of the machine is `or may of any approved form, such as shown in some ot my former patents, en.'- body'ing' mechanism for traversing the car-- riage and driving the work, so wel-l understood that detail illustration thereof is not necessary".

The bed is of suitable form to support the mechanism and has a table A on one side thereof on which is mounted themliead-stoclr A? and the toot-stock A3 for support-ing the work-holding and driving.. devices. The traversing carriage B is mounted on the opposite side of the bed A on 4suitable tracks vand is adapted to be traversed longitudinally by any well known appropriate mechanisin, not shown. Theslider C is mounted on the top of carriage B and is adapted to slide transversely thereof on a trackv c. The wheel-base C is mounted on the top ot slider C by means of inter-engaging tapered danges c, c2 on their respective edges.`

rl`he grinding wheel C2 is mounted on a suitable shaft c3 gournaled in bearings on the forward end of said wheel-base in the usual manner. A hand wheel c4 is provided on the outer end of the operating shaft for operating' the usual mechanism for feeding the grinding` wheel into thework, as is well understood.

,lournaled in brackets At and A5 near the respective ends of the bed A. is a pattern shaft l0 on which is formed the pattern of the cams to be ground. Said shaft is connected by a sprocket chain-belt l1 mounted on a sprocket wheel 13 on a countershaft 12 with a sprocket wheel 14 on the shaft in the head-stock A2. Said sprocket wheel 13 is formed with a double tace one of which has gear teeth l0 which mesh with the teeth ot pinion4 l5 on saidfshatt l0. A sha'ft 'i6 is? gournaled in bearings in the lower vends of arms Ci aud C5, which project troni'the rear end or" slider C, 17 is mounted on said shaft which is adapted to hear upon said pattern shaft. la rod 18 extends. out from the rear side oi' carriage with which it is connected by a downwardly screw-threaded perforation at its inner end.

through' a perforation in bracket .C5 of the slider C and has a coiled. spring l@ interposed between a shoulder in said `hracltet and a nut 950 on its outer end, and serves to torce said slider toward the work and hold the wheel 17 iirmly' against the pattern shaft l0 at all times. The tension ot said spring 19 can be regulated by adjust-ment 'of the nut 20. A coiled spring 2 is interposed between the inner sine of arm or bracket Ct and a collar'QQ on sha-tt 16. A similar spring' 23 is Vinterposed between Vthe outer tace oit said arm or bracket and a collar 24e on the outer end et said shaft. A brake 25 consisting of a split ring is mounted on a pin 26 on the outer tace of bracket if and surrounds a brake wheel 2,7 on the outer end of shatt- 10. rlthe inner tace of said brake is preferably covered withleather or other similar material 28. A screw 29 extends through the parallel i'langes ot the two parts by which it maybe adjusted to clampsaid brake wheel 27 more or less tightly as desired and insure that there will be no motion i the pattern shaft except under the driving torce of the gearing. Any slipping, or vibratory, or lost motion is thus guarded against.V

ln operation, the work lV being driven by suitable connection with the driving power' and a wheelv part p is outward, when spring 23 will '45 the head-stock spindle, the pattern shaft 10 is driven at a like speed through the sprocket belt 11, gear 13 on countershaft 12 and gear 15 on said shaft 10, which meshes with the gear face of said gear 13. The cam patterns carried by shaft 10 being of corresponding form to those of the worlt W and driven at the same speed in the same direction the motion of the work and the pattern will be in exact unison. Wheel 17 onshaft 16 carried by slider G bearing upon the face of the pattern said slider will be moved transversely as said pattern rotates and the grinding wheel C2 'thus maintained in operative relation to the face of the Work at all times. The parts being in position shown in Fig. 1, and the carriage B geared to move fr'om`\left to right over the length of the cam-shaft constituting the work W the grinding wheel C2 will grind cam w of the perfect form corresponding to pattern cam p on shaft 10. Said work and pattern will rotate in unison and the grinding wheel and wheel 17 will move longitudinally in unison until said grinding wheel has com letely traversed the cam w when the side o Wheel 17 may contact with the side of a'concentric ring 70 adjacent to cam-p and hold said wheel until cam p has rotated to bring its highest point into contact With Wheel 17, which point will be in line with the face of part p. The halting of Wheel 17 hascaused sprintf 23 to be compressed between collar 24 on -that as soon as cam p has rotated to bring face of said wheel 17 in line with the face of part p said spring will expand and draw said wheel onto said face which will hold slider C steady While grinding wheel C2 is traversing lthe part of the work w between the cam faces. As the side of Wheel 17 contacts with the side of the next cam p2 of the pattern it is againhalted until the portion of its face which is in line with the face of again expand to pull said wheel forward onto the face of pattern p2. The operation continues throughout the length-of the work, when the direction of the travel of the carriage is reversed and the" operation is repeated in the reverse direction, spring 21 operating between collar 22 and the inner face of bracket Ct to carry wheel 17 along from one part of the pattern to the other. The tension device consisting of the spring 19 bearing between a nut on rod 18, carried by carriage B, and a part of slider C serves to keep the slider forward and the grinding Wheel in const-ant relation to the work at all times, while the brake-25 permits no motion of shaft 10 except as positively driven by the gearing, lthus guarding against backlashand vibration in the parts that could 'interfere with perfect results in the operation of the machine. The patterns on shaft 10 are made larger in diameter than the cam -tern of the work to be ground, and a yiel 'connection between said slider and said patlmft. 1e so Leraars being ground for the reason that stidness in the parts is required to operate the 'slider U accurately, with its Wheel base C and wheel C2 on top of it, but the throw of the cams is equal on both the pattern and the worlr.

Having thus fully described my said invention, what I claim as new and desire to secure by Letters Patent, is

1. A grinding machine for grinding cam shafts comprising a frame, work holding and driving mechanism, a traversing fcarriage, a slider -thereon carrying the grinding wheel, a pattern shaft carrying a series of cams as patterns for the work to be ground, gearing for driving said pattern shaft uniformly with the work, means for holding said sliden yeldinglyin contact with said pattern shaft, and means for moving said Contact means from one pattern cam to the next, substantially as set forth.

2. A grinding machine for grinding cam shafts comprising a frame, Work holding and driving mechanism, a traversing carriage,

a slider thereon, a grinding wheel on said slider, a pattern shaft mounted on the frame adjacent to a part of said slider and carrying cams of larger size but in shape a at# ing tern, whereby the grinding Wheel is heldin constant relation to the work, substantially asset forth.

3. A grinding machine comprising a pati vtern/shaft with a series of lcams thereon as patterns for the Work and mounted adj acent to the slider carrying thegrinding Wheel, a yielding connection between said slider and said pattern shaft, and means for moving said connection fronfone cam on said pattern shaft to the next, substantially as set forth. l v

4f. lln a grinding machine, the combination of the frame, a traversing carriage thereon, a' slider on said carriage, a inding Wheel on said slider, the Work hol ing devices, a pattern `shaft j ournaled on the frame adjacent to a part of said slider and carrying cams of same shape but larger in size than the work, gearing for driving the work and pattern shaft in unison, a contact wheel carried on the slider and adapted to bear upon said patternl shaft, and a tension device `interposed. between a art of the slider and a part of the carriage or holding said wheel 1nto constant contact with said pattern shaft under yielding pressure, substantially as set forth. l

5. ln a grinding machinq, the combination of a frame, a carriage, a slider thereon, a grinding. wheel on said slider, the Work holding devlces, a attern shaft adjacent'to a part of the sli er carrying the attern for the work to be ground gearing or driving the work and pattern shaft in unison, a contact wheel mounted on a shaft carried inl a slider carrying the grinding Wheel, a con-v tomara bearings on the slider arranged to contact with said pattern shaft, said shaft being mounted to yield longitudinally as said wheel asses from one part of the pattern to anot er, and means for holding said Wheel yieldingly in contact With said pattern, substantially as set forth.

6. A grinding machine comprisin a pattern shaft carrying the pattern for tide Work adjacent to the slider, a Contact device carried by said slider to bear upon said pattern, and means for holding said device on said patternyieldingly in bot-h a transverse and a longitudinal direction, substantially as set forth.

7. n a grinding machine, the combination of a frame, a carriage, Work holding devices, a grinding wheel mounted onra slider, a pattern shaft adjacent to said slider', said slider, a contact Wheel mounted on a shaft carried by said slider, said shaft mounted to move longitudinally in its bearings, and tension devices to hold said shaft to normally move with said slider, substantially as set forth.

8. In a grinding machine, the combination of the frame, a carriage, Work holding devices, a pattern for the Work on the frame,

tact wheel on a shaft carried by said slider adapted to bear upon said pattern, said shaft mounted to slide longitudinally in its bearings, a collar fixed on said shaft on each side of'one of said bearings, and a spring interposed between said bearing andeach collar,

substantially as set forth.

9. A grinding machine comprising a frame, a carriage, a slider a grinding wheel thereon, Work holding evices, a pattern shaft, gearing fordriving the work and pat-4 tern shaft uniformly, a contact Wheel mounted on a shaft, said shaft mounted to move longitudinally in bearings on said slider, means for holding said shaft to move normally with said slider, means for holding said contact Wheel yieldingly to said pattern shaft, and means for moving said shaft With ing evices, a pattern shaft carrying the pat# tern for the'Worlt, a brake for holding said pattern shaft against accidental movement, gearing for driving said Work and pattern in unison, a contact carried by the slider and held yieldingly to said pattern and adapted to move longitudinally independent of the slider, and means for holding said shaft to move normally with said slider, substalh tially as set forth.

In Witness whereof, I have hereunto set my hand and seal at Washington, District of Columbia this 29th day of June, A. D. nineteen hundred and nine.

ABRAHAM B. LANDis. [La] Witnesses:

E. W. BRADFORD, J. D. YOAKLnY. 

